internet explorer - Struts2 StreamResult not working in IE8 -

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i'm trying allow downloading of pdfs located on file system. have action class downloadfileaction extends actionsupport following:

public string execute() {   // lookup file   inputstream = new fileinputstream(file);   return success; }  public string getcontenttype() {   return "application/pdf"; }  public string getcontentdisposition() {   return "attachment;filename=\"filename.pdf\""; }

my action mapping defined you'd expect:

<action name="downloadfile" class="com.foo.downloadfileaction">   <result name="success" type="stream">     <param name="allowcaching">false</param>   </result> </action>

this works great in firefox , ie9, fails work in ie8 unknown reasons. thoughts?

update: using live http headers plugin, see when doing download in firefox. assume same in ie8:

 http://fmpdmb:7001/shopping/search/printitemdetail.action?upid=41271812&oet2rtjy=lij8hdlqt7igptdozbz5ocig   /shopping/search/printitemdetail.action?upid=41271812&oet2rtjy=lij8hdlqt7igptdozbz5ocig  http/1.1   host: fmpdmb:7001   user-agent: mozilla/5.0 (x11; ubuntu; linux x86_64; rv:13.0) gecko/20100101 firefox/13.0.1   accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8  accept-language: en-us,en;q=0.5   accept-encoding: gzip, deflate  connection: keep-alive   referer: http://fmpdmb:7001/shopping/search/searchresultitemdetail.action?upid=41271812  cookie: adminconsolesession=vqpcpk2n58p1qztlrpvhywjvs9pdmt2b60pdrpqhrbhqhjgblmhv!-1356202776;  emall-session=r7fbprmcq1dvqt1wkf214nznpt61l03jhhn1d7z8tzzh5tzcxvdm!1350268378   http/1.1 200 ok  cache-control: no-cache   date: wed, 27 jun 2012 15:48:00 gmt   pragma: nocache, no-cache   transfer-encoding: chunked  content-type: application/pdf   expires: 0   content-disposition: inline;filename="document.pdf"   x-powered-by: servlet/2.5 jsp/2.1

update: bit more info. think may have fact app running under https. help?

the action should this:

<action name="download" class="com.project.downloadaction">     <result name="success" type="stream">       <param name="contenttype">application/pdf</param>       <param name="inputname">inputstream</param>       <param name="contentdisposition">attachment;filename="download.pdf"</param>       <param name="buffersize">1024</param>     </result>    </action>

update

check out article: internet explorer cannot download https://something. if using https , prevent caching, download fail.

try define prevent error:

 cache-control: private, max-age=15

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